According to Ole Vanggaard, ́the borderland between architecture and engineering is chaotic, a dangerous field to work in. Here the basic rules of art and technique are not valid. ́ In the course of his career, the Danish engineer has worked with many architects to realize technically challenging structures. This book consists of articles and essays by architects and engineers that bear witness to Vanggaard ́s engagement with architecture and structure, his ability to introduce dynamics, beauty, and strength in his projects. For him, chaos makes sense, and concepts are developed from a focused perception and an ability to develop calculation methods for complicated constructions.